1. Consult your owner's manual: It's the most reliable source for such information.
2. Search online: Many automotive forums, websites, and repair manuals offer detailed information on specific engine models. Try searching for "1988 Mazda 929 3.0L engine interference" online.
3. Contact a mechanic or Mazda dealership: They will have access to technical information and can provide you with the correct answer.
Knowing whether your engine is interference or non-interference is crucial for timing belt maintenance. A broken timing belt can cause serious damage to an interference engine, while it might not cause significant damage in a non-interference engine.